<template>
    <div>
        <!-- 面包屑导航区域 -->
       <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片试图区域 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <el-table :data="roleslist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope='scope'>
                       <el-row :class="[i1===0?'bdtop':'','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id"> 
                           <!-- 渲染一级权限 -->
                           <el-col span=5>
                               <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                               <i class="el-icon-caret-right"></i>
                           </el-col>
                           <!-- 渲染二级和三级权限 -->
                           <el-col span=19>
                               <!-- 通过for循环嵌套渲染二级权限 -->
                               <el-row :class="['bdbottom',i2===0?'bdtop':'','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                                   <el-col :span="6">
                                       <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                       <i class="el-icon-caret-right"></i>
                                   </el-col>
                                   <el-col :span="18">
                                       <el-tag type='warning' v-for="(item3,i3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">{{item3.authName}}</el-tag>
                                   </el-col>
                               </el-row>
                           </el-col>
                       </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" >
                    <template slot-scope="scope">
                        <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
                        <el-button type="danger" size="mini" icon="el-icon-delete">删除</el-button>
                        <el-button type="warning" size="mini" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <!-- 分配u权限对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setDialogVisible"
            width="50%"
            @close="setRightDialogClose">
            <!-- 树形控件 -->
            <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all
             :default-checked-keys="defKeys" ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        data(){
            return{
                // 所有角色列表数据
                roleslist:[],
                // 控制分配权限对话框的显示与隐藏
                setDialogVisible:false,
                rightsList:[],
                // 树形控件的属性绑定对象
                treeProps:{
                    label:'authName',
                    children:'children'
                },
                // 默认绑定的数组
                defKeys:[],
                // 当前即将分配权限的角色id
                roleId:''
            }
        },
        created(){
            this.getRolesList()
        },
        methods:{
            // 获取所有角色的列表
            async getRolesList(){
                const {data:res}=await this.$http.get('roles')
                // console.log(res);
                if(res.meta.status!==200){
                    return this.$message.error('获取角色列表失败');
                }else{
                    this.roleslist=res.data
                    // console.log(this.roleslist);
                }
                
            },
            // 根据id删除所对应的权限
            async removeRightById(role,rightId){
                // 弹框提示用户是否删除
                const confirmResult=await this.$confirm('此操作将永久删除该用户, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err=>{
                    return err
                })
                // 如果用户确认删除，则返回字符串confirm
                // 如果用户取消了删除，则返回字符串cancel

                // console.log(confirmResult);   
                if(confirmResult!=='confirm'){
                    return this.$message.info('已经取消了删除')
                }
                // ${xx}将xx转变为变量
                const {data:res}=await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
                if(res.meta.status!==200){
                    return this.$message.error('删除权限失败')
                }
                this.$message.success('删除权限成功')
                // this.getRolesList()
                role.children=res.data

            },
            //展示分配权限的对话框
            async showSetRightDialog(role){

                this.roleId=role.id
                // 获取所有权限的数据
                const {data:res}=await this.$http.get('rights/tree')
                
                if(res.meta.status!==200){
                    return this.$message.error("获取权限列表失败")
                }
                // 把获取到的权限列表保存在data中
                this.rightsList=res.data
                console.log(this.rightsList)

                // 递归获取三级节点的ID
                this.getLeafKeys(role,this.defKeys)
                this.setDialogVisible=true


            },
            // 通过递归的形式获取角色下三级权限的id，并保存到defKeys数组中
            getLeafKeys(node,arr){
                // 如果当前节点node不包含children属性，则是三级节点
                if(!node.children){
                   return arr.push(node.id) 
                }
                // 调用递归获取子节点
                node.children.forEach(item =>this.getLeafKeys(item,arr)
                );
            },
            // 监听分配权限界面的关闭
            setRightDialogClose(){
                this.defKeys=[]
            },
            // 点击为角色分配权限
            async allotRights(){
                const keys=[
                    ...this.$refs.treeRef.getCheckedKeys(),
                    ...this.$refs.treeRef.getHalfCheckedKeys(),
                ]
                // 形成以，拼接的字符串
                // console.log(keys);

                const idStr=keys.join(',')
                const {data:res}=await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})
                if(res.meta.status!==200){
                    return this.$message.error("分配权限失败")
                }
                this.$message.success("分配权限成功")
                this.getRolesList()
                this.setDialogVisible = false
            }
        }
        
    }
</script>

<style lang="less" scoped>
.el-tag{
    margin: 7px;
}
.bdtop{
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}
.vcenter{
    display: flex;
    align-items: center;
}
</style>